/**
 * ***************************************************************************** Copyright (c) 2000,
 * 2005 IBM Corporation and others. All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0 which accompanies this
 * distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
 *
 * <p>Contributors: IBM Corporation - initial API and implementation
 * *****************************************************************************
 */
package org.tigris.subversion.subclipse.ui.comments;

import java.util.Vector;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

class CommentTemplatesContentHandler extends DefaultHandler {

  private StringBuffer buffer;
  private Vector comments;

  public CommentTemplatesContentHandler() {}

  /** @see ContentHandler#characters(char[], int, int) */
  public void characters(char[] chars, int startIndex, int length) {
    if (buffer == null) return;
    buffer.append(chars, startIndex, length);
  }

  /**
   * @see ContentHandler#startElement(java.lang.String, java.lang.String, java.lang.String,
   *     org.xml.sax.Attributes)
   */
  public void startElement(String namespaceURI, String localName, String qName, Attributes atts) {

    String elementName = getElementName(localName, qName);
    if (elementName.equals(CommentsManager.ELEMENT_COMMIT_COMMENT)) {
      buffer = new StringBuffer();
      return;
    }
    if (elementName.equals(CommentsManager.ELEMENT_COMMENT_TEMPLATES)) {
      comments = new Vector();
      return;
    }
  }

  /**
   * @see org.xml.sax.ContentHandler#endElement(java.lang.String, java.lang.String,
   *     java.lang.String)
   */
  public void endElement(String namespaceURI, String localName, String qName) {
    String elementName = getElementName(localName, qName);
    if (elementName.equals(CommentsManager.ELEMENT_COMMIT_COMMENT)) {
      comments.add(buffer.toString());
      buffer = null;
      return;
    }
    if (elementName.equals(CommentsManager.ELEMENT_COMMENT_TEMPLATES)) {
      CommentsManager.commentTemplates = new String[comments.size()];
      comments.copyInto(CommentsManager.commentTemplates);
      return;
    }
  }

  /*
   * Couldn't figure out from the SAX API exactly when localName vs. qName is used.
   * However, the XML for project sets doesn't use namespaces so either of the two names
   * is fine. Therefore, use whichever one is provided.
   */
  private String getElementName(String localName, String qName) {
    if (localName != null && localName.length() > 0) {
      return localName;
    }
    return qName;
  }
}
